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VERSION:2.0
X-WR-CALNAME;VALUE=TEXT:ITC Pizza Lunch
PRODID:-//Harvard events data//EN
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UID:event_1108681_0
SUMMARY:ITC Pizza Lunch
DESCRIPTION:<table border="0" cellpadding="0" cellspacing="0" width="601">	<tbody>		<tr height="28">			<td height="28" width="224">				Anna Rosen (ITC)<br><br>Title: Gone with the wind: Where is the missing stellar wind energy<br>from massive star clusters?<br><br>Abstract: Star clusters larger than ∼103 M⊙ contain multiple hot stars<br>that launch fast stellar winds. The integrated kinetic energy carried<br>by these winds is comparable to that delivered by supernova<br>explosions, suggesting that at early times winds could be an important<br>form of feedback on the surrounding cold material from which the star<br>cluster formed. However, the interaction of these winds with the<br>surrounding clumpy, turbulent, cold gas is complex and poorly<br>understood. Here, we investigate this problem via an accounting<br>exercise: we use empirically determined properties of four<br>well-studied massive star clusters to determine where the energy<br>injected by stellar winds ultimately ends up. We consider a range of<br>kinetic energy loss channels, including radiative cooling, mechanical<br>work on the cold interstellar medium, thermal conduction, heating of<br>dust via collisions by the hot gas, and bulk advection of thermal<br>energy by the hot gas. We show that, for at least some of the<br>clusters, none of these channels can account for more than a small<br>fraction of the injected energy. We suggest that turbulent mixing at<br>the hot–cold interface or physical leakage of the hot gas from the HII<br>region can efficiently remove the kinetic energy injected by the<br>massive stars in young star clusters. Even for the clusters where we<br>are able to account for all the injected kinetic energy, we show that<br>our accounting sets strong constraints on the importance of stellar<br>winds as a mechanism for feedback on the cold interstellar medium.<br><br>------------------------------<wbr></wbr>------------------------------<wbr></wbr>----<br><br>Atish Kamble (CfA)<br><br>Title: "Radio Supernovae Illuminating the Environments of Massive Stars"<br><br>Abstract: In a supernova explosion, the rapidly expanding shock wave<br>races ahead of the radioactive ejecta and emits synchrotron radiation<br>predominantly in radio waves. This radio emission naturally carries<br>the stamp of the environment, that has been sculpted by the progenitor<br>through winds, eruptions, binary interactions etc., and thus traces<br>the final centuries in the life of the progenitor that are otherwise<br>inaccessible to observations or current theories. Investigation of<br>radio supernovae is, therefore, a powerful tool to probe the<br>progenitors' mass-loss history and its identity as I will show through<br>examples from diverse supernova classes.			</td>		</tr>	</tbody></table>
LOCATION:Phillips
STATUS:CONFIRMED
DTSTART:20180328T150000Z
DTEND:20180328T160000Z
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